Robo-Rabbit Boy, Go!: A Branches Book (Press Start! #7) : Volume 7 (Press Start!) (Library Binding)

Super Rabbit Boy's present to Moon Girl releases Queen Spooky and her army of ghosts, and Super Rabbit Boy is taken captive--so it is up to the normally evil King Viking (who does not like the competition of the ghost army) and especially his secret weapon, Robo-Rabbit Boy (switched to "Good" mode) to save Animal Town, release Super Rabbit Boy, and contain the ghosts.